Question

find the following square by using suitable identify ( 3x-4)²​

Answer 1

Answer:

Suitable identity is (x+a)(x+b)=x2+(a+b)x+ab

(3x+4)(3x−5)=(3x)2+(+4−5)3x+(4×−5)

9x2+(−1)3x+(−20)

9x2−3x−20

Answer 2

Given that:  ( 3x-4)²

As we know the identity,

$(a-b)^{2}$ = $a^{2} - 2ab + b^{2}$

∵ $(3x - 4)^{2} = (3x)^{2} - 2(3x)(2) + 2^{2}$

                  $= 9x^{2} - 12x + 4$